SOLUTION: A dehydrated patient needs 6.8% saline unfortunately the hospital only has 2% and 8% bags how many liters of these solutions should be mixed together to yield 2 liters

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Question 371508: A dehydrated patient needs 6.8% saline unfortunately the hospital only has 2% and 8% bags how many liters of these solutions should be mixed together to yield 2 liters
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 2% solution, B the amount of 8% solution.
1.A%2BB=2
.
.
2A%2B8B=6.8%282%29
2.A%2B4B=6.8
Subtract eq. 1 from eq. 2,
A%2B4B-A-B=6.8-2
3B=4.8
highlight%28B=1.6%29liters
From eq. 1,
A%2B1.6=2
highlight%28A=0.4%29liters